OPTIMIZE: implement caching and pagination

[neoz]

This pull request introduces caching and pagination to improve the efficiency and scalability of the jadx_mcp_server.py module. It adds a caching mechanism to reduce redundant API calls and implements pagination in several methods to handle large datasets more effectively.

Caching Mechanism:

• Introduced a caching system with a configurable expiry time (CACHE_EXPIRY) to store and retrieve data for frequently accessed operations. Helper functions _get_from_cache, _set_cache, and _clear_cache were added to manage the cache.

Pagination Support:

• Updated the following methods to include optional offset and count parameters, enabling paginated retrieval of data:
  • get_all_classes: Fetches a paginated list of all classes.
  • search_method_by_name: Searches for a method name across all classes with pagination.
  • get_methods_of_class: Lists all method names in a class with pagination.
  • get_fields_of_class: Lists all field names in a class with pagination.

Improved Data Handling:

• Enhanced the handling of API responses by adding JSON parsing and error handling to ensure robustness when processing data.

[zinja-coder]

@neoz thanks.